CA 88 is the Carson Pass Road. The summit is at 8,573 feet and westbound it goes almost to sea level so it's a long descent. How long is your motorhome and will you be towing?
I might suggest you get a copy of Mountain Directory West for Truckers, RV, and Motorhome Drivers. CA 88 is on page 18. It says that west of the summit has about 5 miles of 5-6 percent grade. Then "Highway 88 is a roller coaster descent and would be too confusing to describe. There is almost 20 miles of road between the 8,000' mark and the 7,000' mark, but there is only 12 miles of road between the 7,000' and 5,000' mark. Some grades are in the 7% range for a couple of miles."
Based on the eastbound descent description it looks like your westbound ascent to the summit will be 8% for about 3 miles and about 9 miles of 3-8% (average 4-6%) for a total of 18 miles from the intersection of CA 88 and CA 89 at Markleeville near Alpine Village.
I would say it depends on how comfortable you are driving our western mountains. California tries to keep this pass open during the winter which tells you it's one of the easier passes, but if you're a flatlander you might want to consider another route.
ArdraF
